Method for producing water-soluble homopolymers or copolymers which comprise (meth)acrylamide

a technology of water-soluble homopolymers and copolymers, which is applied in the field of producing water-soluble homopolymers or copolymers which comprise (meth)acrylamide, can solve the problems of high amount of polymer solution required for polymer flooding, inconvenient to completely exclude oxygen, and chemical degradation of polymers

Active Publication Date: 2019-03-19
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One cause of the chemical degradation of polymers can be the presence of oxygen in the polymer solution.
However, the amounts of polymer solution required for polymer flooding are high.
Under these conditions, it is difficult or at least costly and inconvenient to completely exclude oxygen.
Free-radical scavengers are supposed to react with free radicals such that the free radical is no longer able to attack and chemically degrade the polymer.
However, many users prefer to use polymer granules, polymer powders or other solid polymer preparations that already comprise stabilizers, because this reduces the cost and inconvenience for the end user.
This procedure has the disadvantage that the stabilizer has been ap

Method used

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  • Method for producing water-soluble homopolymers or copolymers which comprise (meth)acrylamide
  • Method for producing water-soluble homopolymers or copolymers which comprise (meth)acrylamide
  • Method for producing water-soluble homopolymers or copolymers which comprise (meth)acrylamide

Examples

Experimental program
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Effect test

example 1

Preparation of a Copolymer of 67% by Weight of Acrylamide and 33% by Weight of Sodium Acrylate

Free-radical oxygen scavenger: sodium 2-mercaptobenzothlazole (0.35% by weight based on monomers)

Initiation at: 0° C.

pH 6.5

Monomer concentration: 30% by weight

[0187]The following were added to a plastic bucket with magnetic stirrer, pH meter and thermometer 112.8 g of a 35% aqueous solution of sodium acrylate, and then successively 108.3 g of distilled water, 164.0 g of acrylamide (49.1% aqueous solution), 1.2 g of diethylenetriaminepentaacetic acid, pentasodium salt (as 5% aqueous solution), 0.42 g of sodium 2-mercaptobenzothiazole and 4 ml of a 4% aqueous solution of 4,4′-azobis(4-cyanovaleric acid) (10 h t1 / 2 in water: 69° C.). After the solution had been adjusted to pH 6.5 with a 20% or 2% sulfuric acid solution, a monomer concentration of 30% by weight of monomers, based on the sum total of all the components of the monomer solution, was set by means of further addition of water, and t...

example 2

Preparation of a Copolymer of 67% by Weight of Acrylamide and 33% by Weight of Sodium Acrylate

Free-radical oxygen scavenger: sodium 2-mercaptobenzothiazole (0.5% by weight based on monomers)

Initiation at: 0° C.

pH 6.5

Monomer concentration: 30% by weight

[0191]The procedure was as in example 1, except that the amount of the free-radical scavenger was altered. The results are summarized in table 1.

example 3

Preparation of a Copolymer of 67% by Weight of Acrylamide and 33% by Weight of Sodium Acrylate

Free-radical oxygen scavenger: sodium 2-mercaptobenzothlazole (1.08% by weight based on monomers)

Initiation at: 0° C.

pH 6.5

Monomer concentration: 30% by weight

[0192]The procedure was as in example 1, except that the amount of the free-radical scavenger was altered. The results are summarized in table 1.

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Abstract

A process for preparing water-soluble homo- or copolymers comprising (meth)acrylamide by free-radical polymerization of an aqueous solution of monoethylenically unsaturated monomers comprising at least (meth)acrylamide in the presence of at least one stabilizer for prevention of polymer degradation by molecular oxygen. The stabilizer is preferably one selected from the group of sulfur compounds, sterically hindered amines, N-oxides, nitroso compounds, aromatic hydroxyl compounds and ketones, more preferably 2-mercaptobenzothiazole or a salt thereof.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a national stage application (under 35 U.S.C. § 371) of PCT / EP2015 / 056531, filed Apr. 10, 2015, which claims benefit of European Application No. 14164736.2, filed Apr. 15, 2014, both applications of which are incorporated herein by reference in their entirety.[0002]The invention relates to processes for preparing water-soluble homo- or copolymers comprising (meth)acrylamide by free-radical polymerization of an aqueous solution of ethylenically unsaturated monomers comprising at least (meth)acrylamide in the presence of at least one stabilizer for prevention of polymer degradation by molecular oxygen. The stabilizer is preferably one selected from the group of sulfur compounds, sterically hindered amines, N-oxides, nitroso compounds, aromatic hydroxyl compounds and ketones, more preferably 2-mercaptobenzothliazole or a salt thereof.BACKGROUND OF THE INVENTION[0003]High molecular weight homopolyacrylamide and water-solub...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F2/10C08F2/56C08F4/04C08F4/40
CPCC08F220/56C08F2/10C08F4/04C08F4/40C08F220/06C08F230/02C08F2216/1433C08F216/1433C08F2/01C08F2/38C08F2/50C08J3/075C08J3/28C08K5/23C08K5/47C08F20/56
Inventor LANGLOTZ, BJORN
Owner BASF AG
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